The serious blows that Tipu Sultan inflicted on the British in the First and Second Mysore Wars affected their reputation as an invincible power. Dr. APJ Abdul Kalam, the former President, in his Tipu Sultan Shaheed Memorial Lecture in Bangalore (30 November 1991), called Tipu Sultan the innovator of the world's first war rocket. Two of these rockets, captured by the British at Seringapatam, are displayed in the Royal Artillery Museum in London. He managed to subdue all the petty kingdoms in the south. He defeated the Marathas and the Nizams and was also one of the few Indian rulers to have defeated British armies.